JJohnson
Banned
The challenge is, at any point between 1700 and 1900, have the non-Romance countries avoid metrification, and if possible, base their units off each other (such as the Holy Roman Empire basing its inch off the English imperial inch, Sweden basing its foot off that of the British Empire, etc.), such that by 1900, only Spain, France, Italy, Portugal, their colonies use metric units, and possibly the Balkan countries and maybe Belgium. The United Kingdom and its Empire and Dominions, and former colonies continue to use imperial units, possibly along with Iceland, Norway, Sweden, Denmark, Netherlands, Belgium, Liechtenstein, Germany, Austria, Luxembourg, and Switzerland at least still using traditional units.